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New Accounting Standards (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2016 | Dec. 31, 2015
Deferred tax asset, current | $ 64,950 | $ 89,177 |  |
Goodwill impairment charge | 77,343 |  |  |
Goodwill | 4,529,645 | 4,390,261 | $ 1,424,591 | $ 1,422,825
Accounting Standards Update 2016 09 [Member] |  |  |  |
Excess tax benefits associated with equity-based compensation | 6,719 |  |  |
Cumulative effect adjustment to Retained Earnings | 1,384 |  |  |
Exploration and Production [Member] |  |  |  |
Goodwill impairment charge | 77,343 | 0 |  |
Goodwill | 77,343 | $ 77,343 | $ 77,343 | $ 77,343
Exploration and Production [Member] | Accounting Standards Update 2017 04 [Member] |  |  |  |
Goodwill impairment charge | $ 77,343 |  |  |

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